Currently the "ngtsc` testing helpers resolve the `fake_core` NPM package using the `TEST_SRCDIR` variable. This is problematic on Windows where Bazel runfiles are not symlinked into the runfiles directory. In order to properly resolve the NPM Bazel tree artifact, we use the `resolveTreeNpmArtifact` runfile helper that properly resolves the artifact properly on all platforms. PR Close #28352